docs: def move(self, group, cluster_ids=None):
          """Assign a group to some clusters.
  
          Example: `good`
  
          """
          if isinstance(cluster_ids, string_types):
              logger.warn("The list of clusters should be a list of integers, "
                          "not a string.")
              return
          self.label('group', group, cluster_ids=cluster_ids)